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P. I. SGHMALTZ. I REGULATOR FOR REPRIGERATING MAGHINES..

AUTOMATIC PRESSURE Patented Aug. 29, 1893.

Dal-552% INVENTOH 'B) M y ATTORNEY) WITNESSES. QC?MZ NITED STATES PATENT OFFICE.

PAUL I. SCHMALTZ, OF HAMBURG, GERMANY.

AUTOMATIC PRESSURE-REGULATOR FOR REFRlGERATlNG-MACHINES.

$PECIPICATION forming part of Letters Patent No. 504,092, dated August 29, 1893.

Application filed December 12,1891. Sen'alNo. 414,776. (NomodeL) To all whom it may concern.-

Be it known that 1, PAUL I. SCHMALTZ, a subject of the German Emperor, residing in Hamburg, in the Empire of Germany, have invented certain new and useful Improvements in Pressure-Regulators, of which the following is a specification.

This invention relates to pressure regulators principally designed for use in connection with refrigerating apparatus. v In the accompanying drawings, Figure represents a diagram of the low pressure coils of a refrigerating plant in which myimproved pressure-regulator is drawn on a larger scale and in vertical longitudinal section; and Fig. 2 is a vertical longitudinal section on line 2 2, Fig. l.

Similar letters of reference indicate corresponding parts.

Referring to the drawings, 0 Cis a diagrammatic illustration of the low pressure-coils of a refrigerating apparatus, in which coils the refrigerating medium is permitted to expand so as to be at low tension therein. The low pressure-coils are connected by one or more pipes O 0' shown diagrammatically with each other and with a diaphragm-chamber A the flexible diaphragm d of which is acted upon at one side by the pressure of the expanded refrigerating medium in the coils C, while the other side of the diaphragm is acted upon by atmospheric pressure. To the center of the diaphragm d is attached a spindle d to the upper end of which a cup-shaped plate at is applied, between which and a screw-plug p a helical cushioning spring sis interposed. The screw-plug 1o screws into an interiorly-threaded fixed sleeve 19' that is supported by the frame of the pressure-regulating device. In the plug 10 is adjusted a central rod 10 which extends downward toward the spring-supporting cup d and which serves as a stop for the diaphragm (1 when the maximum-expansion of the same is reached. The stop 19 is adjusted in the plug 19 by applying a wrench to the square upper end of the same. The tension of the spring s is adjusted by the threaded plug 19 which is likewise provided with a head for applying the adjusting wrench. The fixed sleeve 10' is further provided with an exterior screw-thread over which is screwed a cap it which is preferably of hemispherical shape and which serves to protect'the tensionadjusting devices of the spring and the stopdeviceagainst being tampered with.

The spindle d is provided below the cupshaped supporting plate (1 with a-fixed pivotpin cl" to which are attached the forked end or ends of one or more levers Z which are fastened at their opposite ends to the spindle or spindles of an expansion-cooker cocks e so that they are turned on their-axes when the pressure in the refrigerating-coils C and the diaphragm-chamber A rises so that the supply-channel m is closed to a greater or less extent in proportion to the pressure, while the same is opened when the pressure is diminished so as to permit thereby a smaller or larger amount of the refrigerating medium to pass from the high-pressure side of the refrigerating apparatus to the low pressure or expansion-side of the same.

It may be advisable in some cases to have several connecting pipes 0 between the low pressure coils C, so as to more uniformly equalize the pressure in the expanding coils C and produce thereby a mean pressure in the diaphragm-chamber. This however is not necessary in all cases, as for most purposes one connection C between the expanding' coils will be sufficient.

In addition to the expansion-cock or valve c it is advisable to use a stop-cock f in the supply-channel, by the use of which the expansion-cock e can be given a loose fit so that it will turn easier and can be adjusted with greater facility. The position of the stopcock f relatively to the expansion-cock e is dependent on other arrangements of the refrigerating plant and may be located either on the high pressure or low pressure side of the expansion-cock. The stop-cock may also be arranged in the nature of a casing for the expansion-cock e, as shown at E on the lefthand side of Fig. l and in section in Fig. 2, in which case the entire arrangement is more compact and convenient for use. As shown on the right hand side of Fig. 1, it is located in the supply channel leading to the expansion cook. The lever lie in this case connected with the valve-spindle t, which is threaded at its outer end, by means of athreaded eye in its end,

a jam-nut 'n and after adjustment by a pin or key '5. The spindlet may be of straight or tapering shape and provided with a recess at that part e which is in line with the supplychannel. To the spindle t is applied the stop-cock E which is shown in Fig. 2 to be of conical shape and retained in its seat by a springf that presses on the larger end of a stop-cock f and which is inclosed by a suitable casing f A stuffing-box is arranged at the outer end of the stop-cock where the spindlet passes to the outside so as to prevent any escape of the refrigerant. The expansion-cocks may be preferably packed with asbestus, which requires but a small degree of pressure to secure the tight fitting of the parts. The supply-channels are preferably made in one casting with the supportingframe, one section of the diaphragm-chamber and the fixed sleeve in which the screw-plug for the pressure-regulating spring of the diaphragm is arranged.

By my improved pressure-regulator, the pressure in the low pressure-coils or chamhers is automatically regulated and uniformly retained at thepressure required in said coils. It dispenses thereby with the unreliable regu-. lating by hand and with the necessity forskillful and trained mechanics for attending to refrigerating plants.

Having thus described my invention, what I claim as new, and desire to secure by Let-. ters Patent, is-

1. The combination of a low pressure coil, a supply channel therefor, a regulating cock in said supply channel for regulating the flow of fluid thereto from the high pressure coil, a chamber a diaphragm in said chamber ex posed on one side to the fluid pressure of said low pressure coil, a spindle connected with said diaphragm and provided with a cup, a screw-threaded sleeve disposed opposite said diaphragm, a screw-plug in said sleeve, a spring, an adjustable stop pin extending through said plug, and a lever connecting said spindle with said regulating cock.

2. The combination of a low pressure coil, a diaphragm chamber, pipes connecting said coil with said diaphragm chamber, a diaphragm in said chamber, a regulating plug arranged in the supply channel for the low pressure coil, and a stop cock surrounding said regulating cock in said supply channel. I

3. The combination of two low pressure coils or chambers, supply channels therefor, regulating cocks in said supply channels, phrag mber, a i p ragm in aid chamber, pipes connecting said coils with said diaphragm chamber on one side of said diaphragm, a spindle attached to said diap ag ev s connecting aid diaph with said regulating cocks, a spring acting on said spindle, a threaded guide sleeve, a screw plug in said threaded guide sleeve for adj usting the tension of said spring, a stop device attached to said screw plug, and a protecting cap on said sleeve.

In testimony that I claim the foregoing as my invention I have signed my name in the presence of two subscribing witnesses.

PAUL I. SGHMALTZ.

Witnesses:

M. F. SCHMALTZ,

l-I. KRAMER,

Baumstr. 

